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OM-1594 Page 35
6-6. Changing Gun Contact Tip
1 Contact Tip Wrench
2 Nozzle
Insert wrench into nozzle over
contact tip.
3 Compression Nut
4 Contact Tip
Loosen nut. Pull out contact tip.
Install new contact tip.
Tighten nut just until contact tip is
secure. Overtightening nut will
damage adapter.
150 437
1
3
4
2
6-7. Replacing Or Cleaning Gun Drive Roll In Pistol-Grip Guns
Turn Off wire feeder and welding
power source.
1 Top Cover
2 Pressure Roll Assembly
Cut off wire where it enters
pressure roll assembly area.
3 Setscrew
4 Current Pick-Up Tab
This tab helps prevent burnback
caused by welding arcs inside the
contact tip. This tab may be re-
moved to provide an insulated drive
roll. (If tab is removed, a smaller di-
ameter contact tip is recom-
mended. See options in Parts List.)
Lightly grease top of tab before rein-
stalling.
5 Drive Roll
Use wire brush to clean drive roll.
Install drive roll with desired groove
down, and turn drive roll so one
setscrew faces flat side of shaft.
6 Bearing
7 Liner
Line up drive roll groove with bear-
ing groove and liner opening.
Tighten setscrews.
If changing drive roll in feeder, see
Section 6-1.
Thread welding wire through gun,
and adjust drive roll pressure, if
necessary (see Section 4-14).
Close and secure pressure roll
assembly. Reinstall top cover.
Ref. 151 599-C
Tools Needed:
5/64 in
2
67
1
5
3
4